<template>
 <el-container class="home-container">
     <!-- 头部区域 -->
  <el-header>
      <div>
          <img src="../assets/heima.png" alt="">
          <span>电商后台管理系统</span>
      </div>
       <el-button type="info" @click="loginOut">退出</el-button>
  </el-header>
  <!-- 主体区 -->
  <el-container>
      <!-- 侧边栏 -->
    <el-aside :width="isCollapse ? '64px':'200px'">
      <div class="toggle-button" @click="toggleCollapse">|||</div>
        <!--   default-active 根据index的值的默认高亮 -->
        <!-- 侧边栏菜单区  unique-opened 默认false 打开一个菜单栏 上一个菜单栏就会关闭  加router表示开启路由模式 path就是index 看index是什么 他就跳转到哪里-->
         <el-menu
      background-color="#333744"
      text-color="#fff"
      active-text-color="#409EFF"
      unique-opened
      :collapse="isCollapse"
      :collapse-transition="false"
      router
      :default-active="activePath"
      >
      <!-- 一级菜单 -->
      <el-submenu :index="item.id+''" v-for="item in menusList" :key="item.id">
           <!-- 一级菜单的模板区 -->
        <template slot="title">
            <!-- 图标 -->
          <i :class="iconobj[item.id]"></i>
          <!-- 文本 -->
          <span>{{item.authName}}</span>
        </template>
        <!-- 二级菜单 -->
      <el-menu-item :index="'/'+subItem.path" v-for="subItem in item.children" :key="subItem.id" @click="saveNavState('/'+subItem.path)">
                  <template slot="title">
            <!-- 图标 -->
          <i class="el-icon-menu"></i>
          <!-- 文本 -->
          <span>{{subItem.authName}}</span>
        </template>
      </el-menu-item>
      </el-submenu>
    </el-menu>  
    </el-aside>
    <!-- 右侧主题 -->
    <el-main>
      <!-- 路由占位符 -->
      <router-view></router-view>
    </el-main>
  </el-container>
</el-container>
</template>

<script>
export default {
  name:"Home",
  data(){
  return{
    //左侧菜单数据
    menusList:[],
    iconobj:{
      '125':"iconfont icon-users",
      '103':"iconfont icon-tijikongjian",
      '101':"iconfont icon-shangpin",
      '102':"iconfont icon-danju",
      '145':"iconfont icon-baobiao"
    },
    // 是否折叠
    isCollapse:false ,
    //被激活的链接地址
    activePath:""
  }
  },
      created(){
      this.getMenuList()
      this.activePath= window.sessionStorage.getItem("activePath")
    },
  methods: {
      loginOut(){
        window.sessionStorage.clear()
        this.$router.push("/login")
      },
      async getMenuList(){
        const {data:res} =  await this.$http.get("menus")
        if(res.meta.status !==200) return this.$message.error(res.meta.msg)
        this.menusList = res.data
      },
      //点击按钮,切换菜单的折叠
      toggleCollapse(){
         this.isCollapse =! this.isCollapse
      },
      //保存链接的激活状态
      saveNavState(activePath){
     window.sessionStorage.setItem("activePath",activePath)
     this.activePath= activePath
      }
  },
}
</script>

<style scoped> 
 .home-container{
     height: 100vh;
 }
 .el-header{
 background-color: #373D41;
 display: flex;
 justify-content: space-between;
 padding-left: 0;
 align-items: center;
 color: #fff;
font-size: 20px;

 }
 .el-aside{
     background-color: #333744;
 }
 .el-menu{
   border-right: none;
 }
 .el-main{
     background-color:#eaedf1;
 }
 .el-header div{
     display: flex;
     align-items: center;
 } 
  .el-header div span{
      margin-left: 15px;
  }
  .iconfont {
    margin-right: 10px;
  }
  .toggle-button{
    background-color: #4A5064;
    font-size: 10px;
    line-height: 24px;
    color: #fff;
    text-align: center;
    letter-spacing: 0.2em;
    cursor: pointer;
  }
</style>